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Earnings Per Share (Schedule of Basic and Dilutive Earnings per Share) (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Series A, B and C Common Stock        
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Net income per share, basic (in dollars per share) $ 0.30 $ 0.65 $ 0.31 $ 1.02
Net (loss) income per share, diluted (in dollars per share) 0.30 0.64 0.31 1.01
Series C-1 Convertible Preferred Stock        
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Net income per share, basic (in dollars per share) 5.73 12.54 5.93 19.65
Net (loss) income per share, diluted (in dollars per share) $ 5.72 $ 12.50 $ 5.92 $ 19.56